Structural Analysis of Deepwater Steel Catenary Riser using OrcaFlex

OrcaFlex를 이용한 심해 SCR 구조 해석

Park, Kyu-Sik;Choi, Han-Suk;Kim, Do-Kyun;Yu, Su-Young;Kang, Soo-Chang

  • Received : 2014.05.20
  • Accepted : 2015.02.09
  • Published : 2015.02.28


The design challenges when attempting to obtain sufficient strength for a deepwater steel catenary riser (SCR) include high stress near the hang-off location, an elevated beam-column buckling load due to the effective compression in the touchdown zone (TDZ), and increased stress and low-cycle fatigue damage in the TDZ. Therefore, a systematic strength analysis is required for the proper design of an SCR. However, deepwater SCR analysis is a new research area. Thus, the objective of this study was to develop an overall analysis procedure for a deepwater SCR. The structural behavior of a deepwater SCR under various environmental loading conditions was investigated, and a sensitivity analysis was conducted with respect to various parameters such as the SCR weight, weight of the internal contents, hang-off angle (HOA), and vertical soil stiffness. Based on a deepwater SCR design example, it was found that the maximum stress of an SCR occurred at a hang-off location under parallel loading direction with respect to the riser plane, except for a wave dominant dynamic survival loading condition. Furthermore, the tensile stress governed the total stress of the SCRs, whereas the bending stress governed the total stress at the TDZ. The weight of the SCR and internal contents affected the maximum stress of the SCR more than the HOA and vertical soil stiffness, because the weight of the SCR, including the internal contents, was directly related to its tensile stress.


SCR;Deepwater;Strength analysis;Interference analysis;OrcaFlex


  1. Choi, H.S., Jo, H.J., 1999. Characteristics of Ultra-deepwater Pipelay Analysis. Offshore Technology Conference, TX, USA.
  2. Det Norske Veritas (DNV), 2007. Submarine Pipeline Systems. Offhosre Standard F101, Det Norske Veritas, Oslo, Norway.
  3. HOE, 2013. SCR Modelling and Analysis with a Deepwater Platform, Houston, TX, USA.
  4. Huse, E., 1993. Interaction in Deepsea Riser Arrays. Offshore Technology Conference, TX, USA.
  5. Leffler, W.L., Pattarozzi, R., Sterling, G., 2011. Deepwater Petroleum: Exploration & Production. A Nontechnical Guide, 2nd Ed., PennWell, USA.
  6. McDermott, 2014. [Online] Derrick Barge 50 Avaiable at: [Accessed Feburary 2014].
  7. MCS, Advanced Engineering Solutions, 2005. Independence Hub - MC920 SCR Detailed Design: Riser Design Based & Methodology. Altantia Offshore Ltd., Houston, TX, USA.
  8. Orcina Ltd., 2013. OrcaFlex Manual version 9.6C. Orcina Ltd., Daltongate, Ulverston, Cumbria. UK (
  9. POSTECH, 2012. Marine Riser Technology. Short-term course in GEM, Pohang University and Science and Technology, Pohang, Republic of Korea.
  10. Yu. S.Y., Choi, H.S., Lee, S.K, Kim, D.K., 2014. Trend and Review of Corrosion Resistant Alloy (CRA) for Offshore Pipeline Engineering. Journal of Ocean Engineering and Technology, 28(1), 85-92.
  11. American Petroleum Institute (API), 1998. Design of Risers for Floating Production Systems (FPSs) and Tension-leg Platforms (TLPs). Recommended Practice 2RD, American Petroleum Institute, Washington, USA.
  12. American Petroleum Institute (API), 2007. Interim Guidance on Hurricane Conditions in the Gulf of Mexico. API Bulletin 2INT-MET, American Petroleum Institute, Washington, USA.
  13. Bai, Y., Bai, Q., 2005. Supsea Pipeline and Riser. Elsevier Ltd., Oxford, UK.

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